Natural etching structure on a crystal face of diamond (trigons), polarised light
Spinel crystal in dolomite marble, Burma
Epigenetic inclusion (probanly melanterite) in quartz, Brazil, parallel polarisers
Inclusions of hematite in aquamarine, Tanzania
Partially etched diamond crystal
Inclusions of rutile (dark crystal and fine needles) and clusters of zircon grains in umbalite garnet, Tanzania
Inclusions of gilalite aggregates in rock crystal from Brazil
Twin-crystal of chrysoberyl
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